Research Article
Detection of Cracks in Rotating Shafts by Using the Combination Resonances Approach and the Approximated Entropy Algorithm
Figure 13
Approximated Entropy value of the combination resonances at 8.7 Hz, 68.7 Hz, and 88.7 Hz (SNR = 1000, ): (a) 1% crack depth; (b) 3% crack depth; (c) 5% crack depth; (d) 10% crack depth.
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